No, the flex number is an actual objective measurement. The flex number is the number of pounds of force it takes to flex the stick 1 inch. When they make sticks they use a machine that flexes them to calculate this for it to be exact, so they are all the same regardless of kick point.
However, the lower the kick point is the faster it will flex because there is less distance from the flex point to the blade. That's why low kick point sticks are marketed as "quick release", and higher kick point are marketed for their loading up power. I wouldn't just buy them based off what style of shot you take though, I'm more of a sniper who takes a lot of slapshots and one-timers but I much prefer a low kick point. It allows me to flex the stick quicker on those one timers and have much better timing in getting them off. When I went from a Supreme to a 1x Lite I was in awe with how quick the puck just popped off my stick with minimal effort, the blade core also makes a difference. Vapors for instance have a much more stiff blade which is lively, better for quick hands & the puck pops off really fast, Supreme blades are much more soft & dampening.